Searching Development-deficient Genes in Edible Mushroom by Self-crossing

[Objective] This study aimed to investigate the effect of mating factor recombination on the development of edible mushroom,and explore the possibility for using self-crossing to breed sporeless/low sporing mushroom strains.[Method] Selecting Agrocybe salicacola strain YAASM0711 as the self-crossing material,six self-crossed combinations were directionally constructed with single spore growth rate as an indicator,to carry out comprehensive analysis of the qualitative traits（color,deformity and growth characteristics）,quantitative traits（shape,yield,size and number of fruit bodies） and mating types of its self-crossed F1 progenies.[Result] After mating factor recombination,self-crossed single spore progenies showed serious genetic differentiation,the average mycelial growth rate and agronomic traits of inbred progenies were lower than those of the parents.The phenotype in fruiting body formation could be divided into normal fruiting and abnormal fruiting（including abnormal fruiting bodies,sporeless or low sporing fruiting bodies,no fruiting）.To be specific,18% self-crossed strains had superior agronomic traits to the parents,which can be used for selecting predominant strains from self-crossed progeny populations based on different breeding purposes.[Conclusion] The genes controlling mycelial growth rate of single spore were linked with mating factors.The mating factor-recombinant single spore strains could be selected according to the correlation between mating type and growth rate.The fruiting result of self-crossed strains indicated that the genes related to sporeless/low sporing development were recessive.Not only genetic materials harboring development-deficient genes in edible mushroom can be obtained by self-crossing,but also the sporeless/low sporing mutant strains with important application prospects can be bred.